What is compatibility?

Is there such a thing as "somebody out there who is right for you and nobody else is" ?

That unless you find this person, or this person appears in your life, whoever you are going to meet and date would not suit you and things would never work out no matter how hard you are ever going to try.

These thoughts appeared in my head after a talk with a friend over drinks today.

That everybody has their own type suited for them.

More often than not we tend to let our heart rule over our minds when it comes to relationships. We forget and lose focus about what we are looking for and just act irrationally.

Is that the right thing?

Or is that how relationships should be governed? Ruled by the heart and one's own gut feel?

Do you still want to try and make things work, to go that extra mile and take it a step futher despite rationalising everything and knowing deep down you are never ever going to find yourself laughing with that person 30, 40 years on this day down the road, both old and grey-haired and both sharing the same bed?

I am so confused.